I bought my Carnivore .30 back in late March, so Ive been shooting it a while now, 3000+ through the barrel now. Ive cleaned it and adjusted hammer spring to shoot over 900fps for a mag starting at 185 bar. I did that because I had a 3000psi tank and wanted higher shooting volume. I shoot down to about 155 bar, 5 shots with ES of 2-5fps on the various groups Ive measured (Ive measured a lot, but it seems to have settled around ES of 4 at these settings, av 80+fpe). Im only doing that because Ive been spending so much time on accuracy and my technique, making me the largest variable. Im getting better, but certainly not as accomplished as BWalton. I consistenty obtain .5-.75" 5 shot groups at 50yd. 75yd was going so well, pushed out to 87 now, can get 4 within 1" but mentality seems to keep that 5th shot out every time.
Trigger is adjustable and can be set quite light, not sure exact poundage never measured. Ive got six Hatsans and have had great luck with Hatsan service. Most recently (last week) I sent them an email telling them what Ive been doing and one mag just wasnt working as well for accuracy. They provided some ideas, which I already had done, they sent me 2 more mags 2-day, no charge.
It can be quite a pull on that bolt, smoothing out will also help. I mention that because your intent is hunting and if you want a quick follow up you probably dont want to remove shoulder position. Smoothing it out will make it easier to accomplish this. I still dont like the auto safety position on the other side of the action because it take your hand out of the grip, but not a big deal I guess.
I bought this to shoot at various times, without drawing attention, but mostly during napping of the children. My bench is about 30yd from house and it was well known I was shooting my SY .45 but with the Carnivore, no one knows. I do not know exact db but the loudest portion of the shot cycle is he hammer ping and pellet when hitting metal targets. I had Roy make the longest LDC for the Sam, which reduced considerably, and the QE is still quieter. Obviously this is only a .30, but at least in my perception, its qieter than my magnum springers.
chris